add abstracted shared memory API

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1265 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/pulsecore/shm.h

@@ -0,0 +1,42 @@
+#ifndef foopulseshmhfoo
+#define foopulseshmhfoo
+
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+ 
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+ 
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+ 
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#include <sys/types.h>
+
+typedef struct pa_shm {
+    unsigned id;
+    void *ptr;
+    size_t size;
+    int do_unlink;
+    int shared;
+} pa_shm;
+
+int pa_shm_create_rw(pa_shm *m, size_t size, int shared, mode_t mode);
+int pa_shm_attach_ro(pa_shm *m, unsigned id);
+
+void pa_shm_punch(pa_shm *m, size_t offset, size_t size);
+
+void pa_shm_free(pa_shm *m);
+
+#endif